1 | <?php
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2 | /*
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3 | * FCKeditor - The text editor for Internet - http://www.fckeditor.net
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4 | * Copyright (C) 2003-2009 Frederico Caldeira Knabben
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5 | *
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6 | * == BEGIN LICENSE ==
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7 | *
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8 | * Licensed under the terms of any of the following licenses at your
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9 | * choice:
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10 | *
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11 | * - GNU General Public License Version 2 or later (the "GPL")
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12 | * http://www.gnu.org/licenses/gpl.html
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13 | *
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14 | * - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
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15 | * http://www.gnu.org/licenses/lgpl.html
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16 | *
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17 | * - Mozilla Public License Version 1.1 or later (the "MPL")
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18 | * http://www.mozilla.org/MPL/MPL-1.1.html
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19 | *
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20 | * == END LICENSE ==
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21 | *
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22 | * Utility functions for the File Manager Connector for PHP.
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23 | */
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24 |
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25 | function RemoveFromStart( $sourceString, $charToRemove )
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26 | {
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27 | $sPattern = '|^' . $charToRemove . '+|' ;
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28 | return preg_replace( $sPattern, '', $sourceString ) ;
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29 | }
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30 |
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31 | function RemoveFromEnd( $sourceString, $charToRemove )
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32 | {
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33 | $sPattern = '|' . $charToRemove . '+$|' ;
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34 | return preg_replace( $sPattern, '', $sourceString ) ;
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35 | }
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36 |
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37 | function FindBadUtf8( $string )
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38 | {
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39 | $regex =
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40 | '([\x00-\x7F]'.
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41 | '|[\xC2-\xDF][\x80-\xBF]'.
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42 | '|\xE0[\xA0-\xBF][\x80-\xBF]'.
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43 | '|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'.
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44 | '|\xED[\x80-\x9F][\x80-\xBF]'.
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45 | '|\xF0[\x90-\xBF][\x80-\xBF]{2}'.
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46 | '|[\xF1-\xF3][\x80-\xBF]{3}'.
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47 | '|\xF4[\x80-\x8F][\x80-\xBF]{2}'.
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48 | '|(.{1}))';
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49 |
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50 | while (preg_match('/'.$regex.'/S', $string, $matches)) {
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51 | if ( isset($matches[2])) {
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52 | return true;
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53 | }
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54 | $string = substr($string, strlen($matches[0]));
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55 | }
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56 |
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57 | return false;
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58 | }
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59 |
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60 | function ConvertToXmlAttribute( $value )
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61 | {
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62 | if ( defined( 'PHP_OS' ) )
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63 | {
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64 | $os = PHP_OS ;
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65 | }
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66 | else
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67 | {
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68 | $os = php_uname() ;
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69 | }
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70 |
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71 | if ( strtoupper( substr( $os, 0, 3 ) ) === 'WIN' || FindBadUtf8( $value ) )
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72 | {
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73 | return ( utf8_encode( htmlspecialchars( $value ) ) ) ;
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74 | }
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75 | else
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76 | {
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77 | return ( htmlspecialchars( $value ) ) ;
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78 | }
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79 | }
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80 |
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81 | /**
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82 | * Check whether given extension is in html etensions list
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83 | *
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84 | * @param string $ext
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85 | * @param array $htmlExtensions
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86 | * @return boolean
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87 | */
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88 | function IsHtmlExtension( $ext, $htmlExtensions )
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89 | {
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90 | if ( !$htmlExtensions || !is_array( $htmlExtensions ) )
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91 | {
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92 | return false ;
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93 | }
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94 | $lcaseHtmlExtensions = array() ;
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95 | foreach ( $htmlExtensions as $key => $val )
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96 | {
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97 | $lcaseHtmlExtensions[$key] = strtolower( $val ) ;
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98 | }
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99 | return in_array( $ext, $lcaseHtmlExtensions ) ;
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100 | }
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101 |
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102 | /**
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103 | * Detect HTML in the first KB to prevent against potential security issue with
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104 | * IE/Safari/Opera file type auto detection bug.
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105 | * Returns true if file contain insecure HTML code at the beginning.
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106 | *
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107 | * @param string $filePath absolute path to file
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108 | * @return boolean
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109 | */
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110 | function DetectHtml( $filePath )
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111 | {
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112 | $fp = @fopen( $filePath, 'rb' ) ;
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113 |
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114 | //open_basedir restriction, see #1906
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115 | if ( $fp === false || !flock( $fp, LOCK_SH ) )
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116 | {
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117 | return -1 ;
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118 | }
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119 |
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120 | $chunk = fread( $fp, 1024 ) ;
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121 | flock( $fp, LOCK_UN ) ;
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122 | fclose( $fp ) ;
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123 |
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124 | $chunk = strtolower( $chunk ) ;
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125 |
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126 | if (!$chunk)
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127 | {
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128 | return false ;
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129 | }
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130 |
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131 | $chunk = trim( $chunk ) ;
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132 |
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133 | if ( preg_match( "/<!DOCTYPE\W*X?HTML/sim", $chunk ) )
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134 | {
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135 | return true;
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136 | }
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137 |
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138 | $tags = array( '<body', '<head', '<html', '<img', '<pre', '<script', '<table', '<title' ) ;
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139 |
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140 | foreach( $tags as $tag )
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141 | {
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142 | if( false !== strpos( $chunk, $tag ) )
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143 | {
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144 | return true ;
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145 | }
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146 | }
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147 |
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148 | //type = javascript
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149 | if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) )
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150 | {
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151 | return true ;
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152 | }
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153 |
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154 | //href = javascript
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155 | //src = javascript
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156 | //data = javascript
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157 | if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
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158 | {
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159 | return true ;
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160 | }
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161 |
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162 | //url(javascript
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163 | if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
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164 | {
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165 | return true ;
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166 | }
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167 |
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168 | return false ;
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169 | }
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170 |
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171 | /**
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172 | * Check file content.
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173 | * Currently this function validates only image files.
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174 | * Returns false if file is invalid.
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175 | *
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176 | * @param string $filePath absolute path to file
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177 | * @param string $extension file extension
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178 | * @param integer $detectionLevel 0 = none, 1 = use getimagesize for images, 2 = use DetectHtml for images
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179 | * @return boolean
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180 | */
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181 | function IsImageValid( $filePath, $extension )
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182 | {
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183 | if (!@is_readable($filePath)) {
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184 | return -1;
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185 | }
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186 |
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187 | $imageCheckExtensions = array('gif', 'jpeg', 'jpg', 'png', 'swf', 'psd', 'bmp', 'iff');
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188 |
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189 | // version_compare is available since PHP4 >= 4.0.7
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190 | if ( function_exists( 'version_compare' ) ) {
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191 | $sCurrentVersion = phpversion();
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192 | if ( version_compare( $sCurrentVersion, "4.2.0" ) >= 0 ) {
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193 | $imageCheckExtensions[] = "tiff";
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194 | $imageCheckExtensions[] = "tif";
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195 | }
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196 | if ( version_compare( $sCurrentVersion, "4.3.0" ) >= 0 ) {
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197 | $imageCheckExtensions[] = "swc";
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198 | }
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199 | if ( version_compare( $sCurrentVersion, "4.3.2" ) >= 0 ) {
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200 | $imageCheckExtensions[] = "jpc";
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201 | $imageCheckExtensions[] = "jp2";
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202 | $imageCheckExtensions[] = "jpx";
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203 | $imageCheckExtensions[] = "jb2";
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204 | $imageCheckExtensions[] = "xbm";
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205 | $imageCheckExtensions[] = "wbmp";
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206 | }
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207 | }
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208 |
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209 | if ( !in_array( $extension, $imageCheckExtensions ) ) {
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210 | return true;
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211 | }
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212 |
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213 | if ( @getimagesize( $filePath ) === false ) {
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214 | return false ;
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215 | }
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216 |
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217 | return true;
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218 | }
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219 |
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220 | ?>
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